In the Riedel equation, this quantity divided by RT makes up one half of the equation. A characteristic exponent of 0.38 is used in Watson's equation 
In the Riedel equation, this quantity divided by RT makes up one half of the equation. A characteristic exponent of 0.38 is used in Watson's equation for calculating this quantity given its value at another point. This can be derived from a combination of the B and C Antoine constants along with the second virial coefficient. It looses its meaning beyond the critical point. This energy is used to overcome the intermolecular interactions between molecules. For 10 points, name this energy required to convert a unit of liquid into a gas at the boiling point.
In the Riedel equation, this quantity divided by RT makes up one half of the equation.
latent {heat of vaporization} [or {enthalpy of vaporization}]